Prepare brownies according to package directions. After the brownies have cooled, take the ice cream out of the container and cut into 1-inch slices. Cut the brownies into two pieces, setting aside one piece for the top cover. Arrange the ice cream slices on top of the “bottom” section of brownie. When complete, cover with the top section of brownie pressing gently to form a brownie-ice cream sandwich. Then cut the brownie into individual squares. Each individual square can then be dipped into the mini chocolate chips so that they evenly coat all four sides. Afterward, wrap the individual squares in plastic wrap and place in the freezer.

Prepare the sauce by mixing together the condensed milk, the 1 1/2 cups of chocolate chips and the vanilla. Heat until melted. Serve chocolate sauce in small ramekins or bowls alongside the brownie ice cream sandwich.